$ docker pull mhart/alpine-node
Using default tag: latest
Error response from daemon: Get https://registry-1.docker.io/v2/mhart/alpine-node/manifests/latest: unauthorized: incorrect username or password

是因为登录失效了，需要重新登录

$docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username (nick@mitnick.fun): lampnick //注意这里需要使用用户名，而不是邮箱
Password: 
Login Succeeded

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